darklock
Member
Last Activity: 08-10-2019, 12:02 AM
Joined: 05-17-2005
Location: California
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K7n2-l
Got a K7N2-L with bulging 1500uf 16V United Chemicons (KZG) Have quite a few of 1500uf 16V Nichicon PL but in the 12.5mm OD size. Decided to use those before buying some 10mm OD size ones, just in case the board had other problems that a cap fix wouldn't cure. Board does POST now, but not sure if Nichicon PL are low esr, as I cannot find any data sheets. -
Re: Yellow caps with F logo and K vents
Hello, I got a chance to work on this board once again. I replaced the four 2700uF Nich PJs with 3300uf caps and the board works now.
Thanks to all. Now to work on the other motherboards that I have waiting.... -
Re: Gigabyte GA-6VTXD - no power?
The seller refunded my money and let me keep the board as well.
So now I have basically "eternity" to determine what might be wrong with it.
In the meantime, I will probably put the Tualatins into an Acorp S815ED (which needs to be recapped...GSC crap caps that are visibily swollen).
Thanks for all of the help from everyone thus far, and the saga continues.
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Re: Gigabyte GA-6VTXD - no power?
Hotflashed the BIOS but still no joy.
Tried an AGP card (I was using a PCI video card previously) and still no power on unless I short PS_ON to ground.
POST card displays dE and speaker beeps 4 rapid beeps, pauses and repeats 4 rapid beeps continuously while POST card cycles between 00 and dE.
I think it is time to give up on this board.....
Any final suggestions before it gets sent back on Friday?Leave a comment:
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Re: Gigabyte GA-6VTXD - no power?
1) 5VSB is present with powersupply off
2) 3.3V present at motherboard on/off switch header
3) I shorted the PS_ON to ground and fans spin.
4) Put in my Tualatin 1.4 CPUs (dualie board) and measure output voltage at MOSFETs to be 1.4V which is correct.
5) MB still won't POST, POST card reads "dd" and speaker beeps tones (I think three beeps) stops, and then repeats
6) CPUs are good as they test fine in an Azza Tualatin ready board. RAM is fine as well as they test good also.
Maybe it is...Leave a comment:
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Re: Gigabyte GA-6VTXD - no power?
I am assuming that you mean to ground the PS_ON line to force the power supply to turn on?
I wonder if there is a logic / IC problem with the board...I was looking at this: [url]http://www.duxcw.com/faq/ps/ps1.htm[/url] and I am wondering if this might be the problem. Maybe the circuit which controls the powersupply cannot hold the signal down?Re: Gigabyte GA-6VTXD - no power?<br...r /> I wonder...Leave a comment:
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Re: Gigabyte GA-6VTXD - no power?
The +5 shorts to ground and then climbs to 830 ohms. Are you saying that the behavior is not suspicious?...Leave a comment:
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Re: Gigabyte GA-6VTXD - no power?
Hello tiresias,
Thanks for that tip. I did find that the resistance between the +5 and ground is only about 830 ohms. It actually starts out much less, and then climbs to about 830 ohms.
Not sure what this means...other than probably the +5 rail is shorting to ground somewhere / somehow...
appreciate any further advice that anyone has.
Thanks.Leave a comment:
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Re: Gigabyte GA-6VTXD - no power?
haven't tested vcore or vdimm because the powersupply shuts down too fast.
Tried three different power supplies. 1) Sparke Power 300W 2) generic 230W 3) RaidMax 450W
All three work on other boards, I use the Sparkle Power as my bench supply and it works on every board I ever hooked up to it, (mainly Socket A boards, Intel 440GX with dual PIII 500, P4 2.66 on ECS MB) with the exception of this Gigabyte
The 230W is currently running my P4 2.66 ECS MB. The RaidMax 450W came from a system which runs a Abit KN8 SLI...
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Re: Gigabyte GA-6VTXD - no power?
Hello again,
Triple checked all capacitors for shorts, and I could not find any. All of the negative leads were tied to ground, and the positive leads did not short to ground at all. The MOSFETs did not have any shorts between any of the gates, so I assume those are OK to.
If I hold the on/off switch in the on position for a few seconds, and then release it, that is when the fans will get enough power to spin for a couple of seconds.
I also had a POST card and all of the main power leds (+12v, -12V, +5v...Leave a comment:
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Re: Gigabyte GA-6VTXD - no power?
thanks for the additional info. I haven't checked for shorts yet, but I already had the CPUs and RAM and video card removed, and still the same symptoms... CPU fans would twitch or sometimes spin for less than a couple of seconds when power on button was pushed....
should be posting and update later today or tonight.Leave a comment:
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Re: Gigabyte GA-6VTXD - no power?
I'll check for shorts and post again tomorrow. I hope the MOSFETS are OK, cause I have read that shorted MOSFETS might be bad news for the CPU or North Bridge chip.
I was lucky on another Gigabyte (GA-7VTXE) with shorted MOSFETS and exploded Choyo 330uf 25V caps. I was able to repair that one. One of the MOFSETS had unsoldered itself from the board.
Hope the GA-6VTXD is repairable.Leave a comment:
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Gigabyte GA-6VTXD - no power?
Hello,
Just got a Gigabyte GA-6VTXD, and it seems to have the symptoms of bad caps. Press the power button and the CPU fans just twitch, or turn for maybe one second. Power supply has tested good on another system.
The board looks to have United Chemicon KZG 3300uf caps, and a bunch of G-Luxon 330uf 25V caps, and some G-Luxon 1000uf 10V. There are a few smaller caps which don't have any vent markings (all G-Luxon).
Can anyone confirm if their GA-6VTXD has UCC KZG 3300uf caps?
All of the caps look physically fine (no buldges or leaks).
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Re: Yellow caps with F logo and K vents
If I understand your reply correctly, if I can find capacitors with the same uf values (560uf & 820uf) but at a higher voltage (6.3v) it would be OK since I am not into overclocking? Looks like I will be able to source the 820uf from [url]www.mouser.com[/url] (Nichicon HE 820uf 6.3v) and the 560uf from [url]www.digikey.com[/url] (Panasonc FC 560uf 6.3v)
Thanks in advanceRe: Yellow caps with F logo and K ve...560uf & 820uf)Leave a comment:
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Re: Yellow caps with F logo and K vents
Wouldn't it be better to just replace these Fujitsu RE's with the same uf rating and as close voltage as possible?
The reason I ask is I have an MSI 6340 ver 1 which had its 2700uf 6.3v caps replaced with Nichicon PJ. It also has four of these Fujitsu RE caps (2 - 4v560uf & 2 - 4v820uf)
The history of the board is not known. I received the board which showed obvious signs that someone did not have the soldering skills to properly solder the 2700uf 6.3v caps...cold solder joints. The board would not even POST....Leave a comment:
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Re: Epox KP6-BS
Actually, DigiKey carries a replacement for this (LX1663CD-ND) but the lead time is 12 weeks.
Anyone know of another electronics supplier in the US that might have it?
I already checked Mouser, but they don't carry it.
Thanks again.Leave a comment:
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Re: Epox KP6-BS
Thanks for the reply. The VRM IC is a LinFinity LX1664CD. Unfortunately the part is obsolete. DigiKey tech rep said that ST Micro L5991AD13TR is an equivalent, but looking at the datasheets for both, the pinouts are different.
Maybe you guys know of an equivalent for the LinFinity part # ?
Cheers.Leave a comment:
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Re: Epox KP6-BS
Well, I replaced the MOSFETs and unfortunately the problem is still there. Still getting 3.8V for the output where slot # 1 CPU should be.
Any other ideas of what I can check?Leave a comment:
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Thanks for the information. I'll give it a shot and post back once I am able to replace them. Might be about a week or so.Leave a comment:
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Any recommendations on where I can get a replacement VRM? I tried to Google the part # D50N03A and nothing of value found. Other markings include K8 5A below the part number & a "M" on the casing. Also, has anyone ever been able to remove one of these from a motherboard? I had tried on a different motherboard in the past, and was never successful.
Thanks again for the tips....Leave a comment:
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